Determinação do índice de estado trófico e simulação do processo de autodepuração de uma fonte de poluição pontual em um corpo receptor

Abstract

Due to the great pollution of water bodies that receive effluents from abattoirs and refrigerators, rich in organic matter and nutrients, it is necessary to evaluate the water quality of these receiving bodies. The objective of this study was to evaluate the water quality of a receiving body of the Medianeira Municipality, by characterizing the concentration of organic matter and nutrients, nitrogen and phosphorus, launched by an agroindustry of slaughterhouses and slaughterhouses. Throughout the autumn season of 2017, four campaigns were carried out to monitor eight sampling points, with the objective of determining the possible impacts that this launch may cause on the quality of the water of the receiving body, the river Alegria. It was also possible to monitor physico-chemical parameters, which were compared with the relevant legislation. Based on the data collected, it was possible to simulate the auto depuration process of the organic matter based on the Streeter-Phelps model, which proved to be efficient to simulate dissolved oxygen concentrations along the studied course. It was also possible to determine the degree of eutrophication of this water body, using the model proposed by LAMPARELLI (2004) for lotic environments, based on total phosphorus concentration. This index was effective and easy to understand results, classifying this part of the river Alegria study as mesotrophic.